pkg-monitoring-plugins/plugins/netutils.c

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/*****************************************************************************
*
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* Nagios plugins network utilities
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*
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* License: GPL
* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
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* Copyright (c) 2003-2008 Nagios Plugins Development Team
*
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* Description:
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*
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* This file contains commons functions used in many of the plugins.
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*
*
* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
*****************************************************************************/
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#include "common.h"
#include "netutils.h"
unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
unsigned int socket_timeout_state = STATE_CRITICAL;
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int econn_refuse_state = STATE_CRITICAL;
int was_refused = FALSE;
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#if USE_IPV6
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int address_family = AF_UNSPEC;
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#else
int address_family = AF_INET;
#endif
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/* handles socket timeouts */
void
socket_timeout_alarm_handler (int sig)
{
if (sig == SIGALRM)
printf (_("%s - Socket timeout after %d seconds\n"), state_text(socket_timeout_state), socket_timeout);
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else
printf (_("%s - Abnormal timeout after %d seconds\n"), state_text(socket_timeout_state), socket_timeout);
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exit (socket_timeout_state);
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}
/* connects to a host on a specified tcp port, sends a string, and gets a
response. loops on select-recv until timeout or eof to get all of a
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multi-packet answer */
int
process_tcp_request2 (const char *server_address, int server_port,
const char *send_buffer, char *recv_buffer, int recv_size)
{
int result;
int send_result;
int recv_result;
int sd;
struct timeval tv;
fd_set readfds;
int recv_length = 0;
result = np_net_connect (server_address, server_port, &sd, IPPROTO_TCP);
if (result != STATE_OK)
return STATE_CRITICAL;
send_result = send (sd, send_buffer, strlen (send_buffer), 0);
if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) {
printf ("%s\n", _("Send failed"));
result = STATE_WARNING;
}
while (1) {
/* wait up to the number of seconds for socket timeout
minus one for data from the host */
tv.tv_sec = socket_timeout - 1;
tv.tv_usec = 0;
FD_ZERO (&readfds);
FD_SET (sd, &readfds);
select (sd + 1, &readfds, NULL, NULL, &tv);
/* make sure some data has arrived */
if (!FD_ISSET (sd, &readfds)) { /* it hasn't */
if (!recv_length) {
strcpy (recv_buffer, "");
printf ("%s\n", _("No data was received from host!"));
result = STATE_WARNING;
}
else { /* this one failed, but previous ones worked */
recv_buffer[recv_length] = 0;
}
break;
}
else { /* it has */
recv_result =
recv (sd, recv_buffer + recv_length,
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(size_t)recv_size - recv_length - 1, 0);
if (recv_result == -1) {
/* recv failed, bail out */
strcpy (recv_buffer + recv_length, "");
result = STATE_WARNING;
break;
}
else if (recv_result == 0) {
/* end of file ? */
recv_buffer[recv_length] = 0;
break;
}
else { /* we got data! */
recv_length += recv_result;
if (recv_length >= recv_size - 1) {
/* buffer full, we're done */
recv_buffer[recv_size - 1] = 0;
break;
}
}
}
/* end if(!FD_ISSET(sd,&readfds)) */
}
/* end while(1) */
close (sd);
return result;
}
/* connects to a host on a specified port, sends a string, and gets a
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response */
int
process_request (const char *server_address, int server_port, int proto,
const char *send_buffer, char *recv_buffer, int recv_size)
{
int result;
int sd;
result = STATE_OK;
result = np_net_connect (server_address, server_port, &sd, proto);
if (result != STATE_OK)
return STATE_CRITICAL;
result = send_request (sd, proto, send_buffer, recv_buffer, recv_size);
close (sd);
return result;
}
/* opens a tcp or udp connection to a remote host or local socket */
int
np_net_connect (const char *host_name, int port, int *sd, int proto)
{
struct addrinfo hints;
struct addrinfo *r, *res;
struct sockaddr_un su;
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char port_str[6], host[MAX_HOST_ADDRESS_LENGTH];
size_t len;
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int socktype, result;
socktype = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
/* as long as it doesn't start with a '/', it's assumed a host or ip */
if(host_name[0] != '/'){
memset (&hints, 0, sizeof (hints));
hints.ai_family = address_family;
hints.ai_protocol = proto;
hints.ai_socktype = socktype;
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len = strlen (host_name);
/* check for an [IPv6] address (and strip the brackets) */
if (len >= 2 && host_name[0] == '[' && host_name[len - 1] == ']') {
host_name++;
len -= 2;
}
if (len >= sizeof(host))
return STATE_UNKNOWN;
memcpy (host, host_name, len);
host[len] = '\0';
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snprintf (port_str, sizeof (port_str), "%d", port);
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result = getaddrinfo (host, port_str, &hints, &res);
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if (result != 0) {
printf ("%s\n", gai_strerror (result));
return STATE_UNKNOWN;
}
r = res;
while (r) {
/* attempt to create a socket */
*sd = socket (r->ai_family, socktype, r->ai_protocol);
if (*sd < 0) {
printf ("%s\n", _("Socket creation failed"));
freeaddrinfo (r);
return STATE_UNKNOWN;
}
/* attempt to open a connection */
result = connect (*sd, r->ai_addr, r->ai_addrlen);
if (result == 0) {
was_refused = FALSE;
break;
}
if (result < 0) {
switch (errno) {
case ECONNREFUSED:
was_refused = TRUE;
break;
}
}
close (*sd);
r = r->ai_next;
}
freeaddrinfo (res);
}
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/* else the hostname is interpreted as a path to a unix socket */
else {
if(strlen(host_name) >= UNIX_PATH_MAX){
die(STATE_UNKNOWN, _("Supplied path too long unix domain socket"));
}
memset(&su, 0, sizeof(su));
su.sun_family = AF_UNIX;
strncpy(su.sun_path, host_name, UNIX_PATH_MAX);
*sd = socket(PF_UNIX, SOCK_STREAM, 0);
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if(*sd < 0){
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die(STATE_UNKNOWN, _("Socket creation failed"));
}
result = connect(*sd, (struct sockaddr *)&su, sizeof(su));
if (result < 0 && errno == ECONNREFUSED)
was_refused = TRUE;
}
if (result == 0)
return STATE_OK;
else if (was_refused) {
switch (econn_refuse_state) { /* a user-defined expected outcome */
case STATE_OK:
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case STATE_WARNING: /* user wants WARN or OK on refusal */
return econn_refuse_state;
break;
case STATE_CRITICAL: /* user did not set econn_refuse_state */
printf ("%s\n", strerror(errno));
return econn_refuse_state;
break;
default: /* it's a logic error if we do not end up in STATE_(OK|WARNING|CRITICAL) */
return STATE_UNKNOWN;
break;
}
}
else {
printf ("%s\n", strerror(errno));
return STATE_CRITICAL;
}
}
int
send_request (int sd, int proto, const char *send_buffer, char *recv_buffer, int recv_size)
{
int result = STATE_OK;
int send_result;
int recv_result;
struct timeval tv;
fd_set readfds;
send_result = send (sd, send_buffer, strlen (send_buffer), 0);
if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) {
printf ("%s\n", _("Send failed"));
result = STATE_WARNING;
}
/* wait up to the number of seconds for socket timeout minus one
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for data from the host */
tv.tv_sec = socket_timeout - 1;
tv.tv_usec = 0;
FD_ZERO (&readfds);
FD_SET (sd, &readfds);
select (sd + 1, &readfds, NULL, NULL, &tv);
/* make sure some data has arrived */
if (!FD_ISSET (sd, &readfds)) {
strcpy (recv_buffer, "");
printf ("%s\n", _("No data was received from host!"));
result = STATE_WARNING;
}
else {
recv_result = recv (sd, recv_buffer, (size_t)recv_size - 1, 0);
if (recv_result == -1) {
strcpy (recv_buffer, "");
if (proto != IPPROTO_TCP)
printf ("%s\n", _("Receive failed"));
result = STATE_WARNING;
}
else
recv_buffer[recv_result] = 0;
/* die returned string */
recv_buffer[recv_size - 1] = 0;
}
return result;
}
int
is_host (const char *address)
{
if (is_addr (address) || is_hostname (address))
return (TRUE);
return (FALSE);
}
void
host_or_die(const char *str)
{
if(!str || (!is_addr(str) && !is_hostname(str)))
usage_va(_("Invalid hostname/address - %s"), str);
}
int
is_addr (const char *address)
{
#ifdef USE_IPV6
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if (address_family == AF_INET && is_inet_addr (address))
return TRUE;
else if (address_family == AF_INET6 && is_inet6_addr (address))
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return TRUE;
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#else
if (is_inet_addr (address))
return (TRUE);
#endif
return (FALSE);
}
int
resolve_host_or_addr (const char *address, int family)
{
struct addrinfo hints;
struct addrinfo *res;
int retval;
memset (&hints, 0, sizeof (hints));
hints.ai_family = family;
retval = getaddrinfo (address, NULL, &hints, &res);
if (retval != 0)
return FALSE;
else {
freeaddrinfo (res);
return TRUE;
}
}